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Model Level

level
This parameter can take values 1 (the default if not given) or 2. The level indicates the treatement of a lossy element, and has no effect if the transmission line is lossless.

Level 1 handles arbitrary RLCG configurations using the Pade approximation approach. A Pade approximation is used as a rational function approximation to the transfer function in the Laplace domain, which has a trivial inverse transformation to the time domain. Further, separability avoids the need to perform a complex convolution at each time point. The model is very fast and accurate enough for most purposes.

Level 2 handles RLC configurations using a full numerical convolution, equivalent to the LTRA model. It does not allow a G element, and is much slower than the Pade approximation approach, however it may be more accurate. Level 2 supports the following types of lines: RLC (uniform transmission line with series loss only), RC (uniform RC line), LC (lossless transmission line), and RG (distributed series resistance and parallel conductance only).


next up previous contents index
Next: Electrical Characteristics Up: Transmission Lines (General) Previous: Transmission Lines (General)   Contents   Index
Stephen R. Whiteley 2017-11-08